Swivel band-saw guide.



No. 770,105. PATENTED SEPT. 13, 1904.

A. PRAUNA.

SWIVEL BAND SAW GUIDE APPLICATION FILED DEO.18. 1903. N0 MODEL. 2SHEETS-SHEET LIIHTII'JHI" mill I semi!!!lHHIHIhnllllllll II,IIIIIII!I(IIIIIIIIIII/I' PATENTED SEPT. 13, 1904.

A. PRAGNA.

SWIVEL BAND SAW GUIDE.

APPLIOATION FILED DEG. 18, 1903.

2 SHEETS-SHEET 2.

N0 MODEL.

lmitwaweo NITED STATES Patented September 13, 1904.

ARTHUR PRACNA, OF EVERETT, WASHINGTON.

SWIVEL BAND- -SAW GUIDE.

SPECIFICATION forming part of Letters Patent No. 770,105, datedSeptember 13, 1904.

Application filed December 18, 1903. Serial No. 185,694. (No model.)

To all whom it may concern.-

Be it known that I, ARTHUR PRAONA, aciti- Zen of the United States,residing at Everett, in the county of Snohomish and State of Washington,have invented a new and useful Swivel Band-Saw Guide, of which thefollowing is a specification.

The invention relates to improvements in upper guides for band-sawmills.

The object of the present invention is to improve the construction ofupper guides for band-saw mills, and to provide a simple andcomparatively inexpensive one adapted to be readily applied to aband-saw mill and capable of counteracting the tendency of a bandlsaw todeviate from or lead out of a straight A further object of the inventionis to provide a band-saw guide of this character capable of leading aband-saw before the same enters the material to be cut and wherebyabsolutely perfect lumber may be obtained.

Another object of the invention is to provide simple and eflicient meansfor adjusting the band-saw guide and for positively holding the same atthe desired adjustment.

The invention also has for its object to provide means for supportingand adjusting the band-saw guide which will not interfere with thearrangement of the guide close to the material to becut and which willpermit the guide to remain in close proximity to the material until thelast piece of lumber is out.

With these and other objects in view the invention consists in theconstruction and novel combination and arrangement of parts hereinafterfully described, illustrated in the accompanying drawings, and pointedout in the claims hereto appended, it being understood that variouschanges in the form, proportion, size, and minor details of constructionwithin the scope of the claims may be resorted to Without departing fromthe spirit or sacrificing any of the advantages of the invention.

In the drawings, Figure 1 is a perspective of a swivel upper band-sawguide constructed in accordance with this invention. Fig. 2 is plan viewof the same. Fig. 3 is a front elevation. Fig. is a sideelevation. Fig.5 is hanger or support 3.

a vertical sectional view. Fig. 6 is a detail sectional view on thelines 6 6, Fig. 5.

Like numerals of reference designate corresponding parts in all thefigures of the drawings.

1 designates the guide proper, which is constructed in the usual manner,being composed of two hinged sides or members, the outer one of which isprovided with an integral upwardly-extending arm or column 2, which ishung or suspended from ahanger or support 3. The hanger or support 3,which may be of any desired configuration, may be attached to a band-sawmill in any desired manner, and the means for connecting the hanger orsupport with the band-saw mill may be varied to suit the character ofthe material to which the sawguide is applied. In the accompanyingdrawings the hanger or support is connected with a pair of links l,provided at their upper ends with eyes for the reception of horizontalpiv ots 5 of a band-saw mill, (not shown,) and the lower ends of thelinks 4 are connected by pivot-bolts 6 or other suitable means with theThe links L are adapted to permit the band-saw guide to movelongitudinally and vertically, whereby should the saw-guide be struck bya log it will rise and clear the same.

The upwardly-extending portion or arm- 2 of the band-saw guide istransversely curved at the top at 7 and is provided at its outer convexface with upper and lower curved flanges 8 and 9, L shape incross-section, to provide a tongue and groove at the bottom of the saidflanges. The curved flanges are arranged in the arc of a circle thecenter of which is coincident with the center of the upright effectivehave body portions approximately L shape in cross-section to fit theupper and lower edges and the inner face of the adjacent portion of thehanger or support 3. The transverselycurved port-ion of the hanger isprovided at its top and bottom with vertically-disposed curved flanges13 and 14, which receive the bearing-plates and to which the same aresecured by bolts or screws 15 and 16. The upper bolts or screws 15 alsoserve to secure a cap or top plate 17 to the upper bearing-plate, andthis cap or top plate, which is approximately semicircular, extends overthe upper end of the arm or column of the band-saw guide to render thebearing dust-proof. By hanging the band-saw guide in this manner it iscapable of a partial horizontal rotation and is adapted to lead theband-saw before the same enters the material to be cut, and it iscapable also of effectually preventing the saw from deviating or leadingout of a straight line, whereby absolutely perfect lumber may be cut.

The upwardly-extending arm or portion of the band-saw guide is providedat the center of the transversely-curved part 7 with a pair ofoutwardly-extending horizontal cars 18, located in an opening 19 of thecurved portion of the hanger or support and adapted to oscillatehorizontally therein. These ears re ceive a pivoted block 19, which issecured between the ears by a pair of vertical pivots 20, havingthreaded shanks, which are arranged in threaded openings of the ears andwhich are provided with reduced squared outer portions adapted toreceive a wrench. The inner ends of the pivots are tapered to providecone-bearings, and the outer portion of the threaded shanks receive jamor looking nuts 21, which prevent any accidental rotation of the pivots.

The pivoted block is provided with a cen' trally-threaded aperture 22,disposed horizontally and receiving the threaded end 23 of a rod orshaft 24, which extends longitudinally of the hanger or support andwhich has its other end journaled on the same in a bearing 24. This endof the operating rod or shaft is provided with a suitable hand-wheel 25,arranged at the outer side of the bearing 24. A collar or flange 26 isarranged at the inner side of the bearing 24:, and a set-screw 27 ismounted on the said bearing for engaging the operating rod or shaft,whereby the same is positively held at any adjustment. When theoperating rod or shaft is rotated, the upwardly-extending arm or portionwill be turned horizontally in the bearings or ways of the hanger orsupport, and the block 19 will oscillate in the space between theprojecting ears and maintain its opening in alinement with the operatingrod or shaft, whereby the latter is prevented from being sprung orstrained. Also the joint prevents any liability of the parts binding orotherwise inter- 5 fering with the adjustment of the saw.

The hanger or support may be connected with suitable supporting-cables28 and 29, as clearly illustrated in Fig. 1 of the drawings. Suitableeyes 30 and 31 are provided for an attachment of the cables, which maybe provided with 'counterbalancing-weights in the usual manner.

It will be seen that the swivel upper bandsaw guide is capable ofleading a band-saw before the same enters the material to be out andthat it is adapted to positively counteract any tendency of the band-sawto deviate from a straight line and that by it absolutely perfect lumbermay be obtained. It will also be apparent that the band-saw guide iscapable of a limited horizontal rotation on an axis or center coincidentwith the center of the band-saw and that simple and positive means areprovided for adjusting the band-saw guide and for securing the same atthe desired adjustment. Furthermore, it will be clear that the means forsupporting and adjusting the band-saw guide permit the latter to bearranged close to the log or other material and to remain in suchposition until the last piece of lumber is sawed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. An upper band-saw guide capable of a horizontal rotary movement on anaxis or center coincident with the center of the guided portion of aband-saw, whereby it is adapted to lead the same before the saw entersthe material to be cut, substantially as described.

2. In a device of the class described, the combination of a hanger orsupport having upper and lower semicircular bearings concentric with thesaw, and an upper band-saw guide having an upwardly-extending armprovided at the top with corresponding semicircular bearings fitting inthose of the hanger or support, whereby the upper band-saw guide is hungfrom the same, and is capable of a horizontal rotary movement to guidethe bandsaw before the same enters the material, substantially asdescribed.

3. In a device of the class described, the combination of a hanger orsupport provided with a horizontal arc-shaped bearing arrangedconcentric with the saw and having a tongue and groove, and an upperband-saw guide having an upwardly-extending arm provided at the top withan arc-shaped bearing portion, the latter having a tongue and groovematching the tongue and groove of the hanger or support, whereby thesaw-guide is hung from and located beneath the latter, said band-sawguide being capable of a horizontal rotary movement, substantially asdescribed.

4:. In a device of the class described, the combination of a hanger orsupport having upper and lower arc-shaped bearings concentric with thesaw, an upper band-saw guide' having an upwardly-extending arm' providedat the top with corresponding arc-shaped bearings fitting in the saidupper and lower bearings, whereby the saw-guide is hung from a hanger orsupport, and is capable of a horizontal rotary movement to guide thebandsaw before the same enters the material, and adjusting meansconnected with the arm at a point between the upper and lower bearings,substantially as described.

5. In a device of'the class described, the combination of a hanger orsupport provided with upper and lower arc-shaped bearingplatesconcentric with the saw and having tongues or grooves, andan upperband-saw guide having an upwardly-extending arm provided at the top witharc-shaped flanges having depending tongues and grooves matching thoseof the bearing-plates, whereby the saw-guide is hung from the hanger orsupport, said guide being capable of ahorizontal rotary movement,substantially as described.

6. In a device of the class described,the combination of a hanger orsupport provided with acurved portion having vertical flanges, upper andlower arc-shaped bearing-plates having tongues and grooves and providedwith flanged portions to fit the flanges of the hanger or support, anupper band-saw guide having an arm or portion provided with arc-shapedflanges having tongues and grooves matching those of the bearing-plates,and a cap extending over the said arm or portion of the band-saw guide,sustantially as described.

7 In a device of the class described,the combination of a hanger orsupport having a curved portion provided with an aperture, said hangeror support being also provided with bearings, an upper band-saw guidemounted in the bearings and capable of a horizontal rotary movement tolead a saw before the same enters the material, ears extending from theband-saw guide and projecting through the aperture of the hanger orsupport, a block pivotally mounted between the ears, and a threadedadjusting rod or shaft mounted on the hanger or support and connectedwith the pivoted block,

substantially as described.

8. In a device of the class described, the combetween the same'with aprojecting portion operating in an opening of the support or hanger, andadjusting means connected with the projecting portion of the arm,substantially as described.

9. In a device of the class described, the combination of a hanger orsupport having a curved portion and provided thereat with upper andlower curved bearings, an upper band-saw guide having a curved portionarranged at the inner face of the curved portion of the hanger orsupport and hung from the bearings of the same, and provided with aprojecting portion extending through anopening of the hanger or support,and a rotary operating rod or shaft journaled on the hanger or supportand having a threaded connection with the projecting portion of theband-saw guide, substantially as described.

10. In a device of the class described, the

combination of a hanger or support having upper and lower curvedbearing-grooves arranged horizontally, a band-saw guide located beneaththe hanger or support and having an arm provided with upper and lowerdepending curved tongues fitting in the said grooves, whereby theband-saw guide is hung from the hanger or support and is capable of ahorizontal rotary movement, a cap or plate mounted on the hanger orsupport and engaging the arm to retain the tongues in the saidbearinggrooves, and means for adjusting the hanger, substantially asdescribed.

11. An upper band-saw guide mounted for horizontal rotary movement, thecenter of which is coincident with the center of the guided portion ofthe saw.

12. An upper band-saw guide mounted for horizontal rotary movement on anarcuate bearing, which is concentric with the saw.

13. An upper band-saw guide mounted for horizontal rotary movement on asemicircular bearing, which is concentric with the saw.

ARTHUR PRACN A.

Witnesses EDWARD MILLs, ETI-IEL EMBREE.

